tommy

I am thinking of concreting the water jackets of a LQ4 block and boring to 4.125. It is to be the powerplant for my track only drag car. Has anyone tryed this with any luck?

Reckless

iTrader: (9)

I really doubt it. How will you cool it without water jackets?

CHRISPY

considering there is only 4.1 bore spacing wouldn't this pose a problem?

DaleMX

iTrader: (4)

Well CR5 blocks can be 4.125 and they use the stock LS1 crank I believe, so the bore spacing must be like 4.25

LOnSLO

iTrader: (15)

Bore spacing is more like 4.48 I believe. Are you planning on running alcohol?

stealth

You can't do 4.125 bore with an LQ4 block, I have one. Maybe 4.080, depending on power levels. Ask MTI.

Taspeed

iTrader: (1)

yes if you concrete in the water jackets you could prolly get away with it for a track/drag only car. I have thought about doing this to some 5.3's and expiramenting with it. I was only planning to do a 70% fill. Not a full fill though. I know old school it is common practice to fill the bbc up and run them without water pumps, but again they fire up...make a run and sit for an hour cooling off. so, yes it should be feasible to do. As far as bore size. I'm questioning the thickness of the actual sleeve bore that is there stock. It may not be that thick. You would really need to sonic test it first as that is a LOT of cylinder wall to take away.

DenzSS

Yup. There is a lot more cylinder wall than a stock ls1/ls6, but there is no way you can get to a 4.125" bore. With the perfect block, you're looking at more like 4.080" and even then you're getting paper thin on the walls.

We ended up going .030" over on my iron block. It was sonic tested and could have supported more. In a street/strip car, I want a much cylinder wall as I can.

stealth

DenzSS,
I want to leave the mountain and make some passes in Topeka, KC, etc. Which track is best?

DenzSS

Topeka is the better track, but personally I prefer KCIR. Smaller track, friendlier people, etc. Just a preference.

If you're looking to bust down some good times, I'd hit Topeka first.

stealth

OK, I have heard that Topeka is a fast track. Thanks.

Nasty N8

iTrader: (33)

We have a 4.125" bore Iron block it is filled with Darton sleeves. It will hold anything you can through at it. The block we have is going to be 1200hp. Should have some dyno runs soon.

Nate

stealth

I have not been referring to sleeved blocks.

DenzSS

Nor have I.

tommy

Did you install the sleeves yourself? Does Darton recommend any epoxies or locking compounds with their sleeves? Thanks for the pictures!

Tommy

CHRISPY

same here, talking about 6L iron blocks bored only. 4.125 isnt going to happen

stealth

It's unanimous, you could bore the LQ4 block to as much as 4.080 (I'm at 4.060), or you could sleeve it to a larger bore. The later option is a topic I know little about, but I suspect that it is relatively expensive.

CHRISPY

I wouldnt even go .080 (I know people have done it) and I certainly wouldnt' spray a .080 over 6L block.

Even going 0.030 over you should sonic test the block. (thickness can vary a lot between cylinders)

stealth

I agree. We have tested my block in every way known to mankind, but I also know a guy here in Denver that tested 6 LQ4 blocks and all of them sucked. If I build another LS1 motor, I'll use aluminum.

DenzSS

Yup.

We went .030" so I could spray it if I wanted to. (after sonic testing)